Re: hangcheck watchdog triggers if clock=pit. Missing code inmonotonic_clock_pit()?

[john stultz]

On Sat, 2004-04-10 at 06:35, Denis Vlasenko wrote:
> linux-2.6.5/arch/i386/kernel/time.c:
> ====================================
> /* monotonic_clock(): returns # of nanoseconds passed since time_init()
>  *              Note: This function is required to return accurate
>  *              time even in the absence of multiple timer ticks.
>  */
[snip]
> linux-2.6.5/arch/i386/kernel/timers/timer_pit.c:
> ================================================
> static unsigned long long monotonic_clock_pit(void)
> {
>         return 0;
> }

Part of the problem is that the PIT timesource cannot account for lost
ticks, thus we cannot strictly conform to the
monotonic_clock()interface. 

So either we just return (jiffies_64 * TICK_NSEC), and just have an
exception to the rule, or the hangcheck watchdog needs to know what to
do when monotonic_clock always returns zero. 

Joel: Do you have a preference?

thanks
-john


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